Throttle Linkage Microswitches

Question 1

Name all of the Throttle Linkage Microswitches.

Answer 1

1. 70% N2 Microswitch
2. Fuel Flow Indicator Cutoff Switch
3. 85% N2 Pressurization Dump Switch
4. 85% N2 Speedbrake Retract Switch
5. 70% Gear Warning Switch
6. Flap/Gear Warning Switch
7. Autopilot/Flap Switch

Question 2

Explain what the 70% N2 Microswitch does

Answer 2

Signals valves to open for engine inlet anti-icing only in the air

Question 3

Explain what the Fuel Flow Indicator Cutoff Switch does

Answer 3

Grounds out indicators to prevent erratic indications below 10% N2

Question 4

Explain what the 85% N2 Pressurization Dump Switch does

Answer 4

Opens and closes to open or close solenoids in control lines for pressurization

Question 5

Explain what the 85% N2 Speedbrake Retract Switch does

Answer 5

Signals speedbrakes to retract when high power settings are used on either engine

Question 6

Explain what the 85% Gear Warning Switch does

Answer 6

Activates warning audible alert if 85% N2 and gear is not down and locked when airspeed is below 130 kts (alert CAN be silenced)

Question 7

Explain what the Flap/Gear Warning Switch does

Answer 7

Activates warning audible alert if lfaps are extended beyond TO/APP setting without gear being down and locked (aler CAN NOT be silenced)